I've not noticed this before, but I had two lights with two grids ( D1s), on a job, and the second light would not fire. I finally figured it out, and the grid on the first keeps the light from reaching the 2nd light. What to do?

I think I've shot with the D1's with multiple lights with grids before without and issue, so I'm puzzled.

Thanks Felix. I had it set to both radio and IR. (what is the difference between radio and IR?)

Anyway, I changed both heads to just Radio, but the problem is the same. I clicked test on either one and the other does not flash.

Are you just firing one from the head itself and the others aren't firing? You should fire from the transmitter. Also, just checking, are they all on the same channel? Infrared must be in the line of sight of an infrared transmitter. Radio doesn't have to be.

So test button from head wont work? That will not fire off the other head with grids?

Do I have to be firing from the Profoto transmitter? I can't fire from Pocket Wizard tranreceiver to Pocket Wizard Receiver?

Just try to understand what is happing here. You have to make sure each unit receives a trigger signal. Pressing the test button on one unit wonŽt send out a trigger to other units, same applies for the PW. So yes, you will have to use a Profoto transmitter to reach the built in receivers or connect a PW receiver to each unit. Slave trigger will need to "see" the flash from other units, so make sure the one receiving your sync signal has some spread or just fire one to a bounce / ceiling, whatever. If the triggered unit is equipped with a narrow grid it wonŽt have enough spill to be seen by the other units. Also position of the cell and lighting conditions (e.g. bright ambient light hitting the cell) will have great impact. HTH.Cheers

Ulf, now today, I had everything set to Radio, with umbrellas and no sync happened. I switched to Slave and it was fine. So Radio is just a Profoto thing?

Ok: My Profoto Air Remote broke, (50$ battery leak), ruined whole unit. Using Pocketwizard instead, so that is why issues with grids? With Air remote you don't even need for light to hit?

That said, I've used grids for years with Lumedyne and Speedetron with Pocket Wizard and never had this problem. Why did I do ok with Lumdeyne and Speedetron grids and Pocketwizard but no Profoto/Pocketwizard?

Ulf, now today, I had everything set to Radio, with umbrellas and no sync happened. I switched to Slave and it was fine. So Radio is just a Profoto thing?

Ok: My Profoto Air Remote broke, (50$ battery leak), ruined whole unit. Using Pocketwizard instead, so that is why issues with grids? With Air remote you don't even need for light to hit?

That said, I've used grids for years with Lumedyne and Speedetron with Pocket Wizard and never had this problem. Why did I do ok with Lumdeyne and Speedetron grids and Pocketwizard but no Profoto/Pocketwizard?

What is PW? and what is HTH?

PW=Pocket Wizard, HTH=Hope this helps, unfortunately it seems as if it did not, so I give it another try.

Each units needs to get the information that it has to fire. This was usually done via a hardwired sync cable. If you added a second light that needs to get the signal from somewhere, too. So the slave was born, a light sensitive cell that triggered when it detected a quick rise of light like from your first flash unit. This light emitted from your triggered first unit may not have enough reach to trigger your additional units in slave mode when you use a grid on it.

To get rid of the sync cable IR (InfraRed) transmitters send the sync signal to receivers either attached to the packs or build into. Today we have RF transmitters like the Pocket Wizard or dedicated systems of the manufacturers.All these transmitters will only work with units that are equipped (and ready to receive the signal from the dedicated channel) with corresponding receivers. IŽm not familiar with Profoto so I cannot comment on a Pocket Wizard being able to trigger the internal RF receiver of your Profoto system, it might be but usually mixed brands wonŽt play together. If you have a Pocket wizard receiver use it with the unit that has the most light output and spill (e.g. your umbrella) and set the rest to slave mode and youŽll be fine or just replace your Profoto transmitter.

Well here's the deal, I used to own the D1's. I prefered to pop the flashes with my Sekonic meter. The only way that wasn't so clumsy was to attach the PW(s) to the input of the flashes. I just didn't (A) taking the remote on and off or (b) lugging the camera around.

I know l_a_z_y. But I had the PW from when I was just using standard flashes as my strobes.

My D1's were stolen and insurance allowed me to replace them with the B1. Even though they are really good with TTL, there are times when I want to use my meter. So I kept the Pocket Wizards.

Plus, now I have a backup if something happens to the remotes. (Yeah, I kept the old air remote too)

Has anyone experienced any problems with Profoto Air Sync Transceiver? I have two of them and two Air Remotes which I use rarely, once a year. Last time I used them, a year ago, all worked seamlessly. Few days ago I tried to do a comparison vs my Elinchrom Skyports vs Broncolor RFS and found out that a Profoto Air Sync Transceiver although seemed working properly (lights, beep, channel, new batteries) wasn't triggering the other Profoto triggers nor my Profoto 8A generator. I've tried many times, no success. I searched the internet and found nothing, seems that none has ever had problems. Any suggestions?